Feature Request : Paint Tools on bitmap Layer

I’m looking forward to the Paint tool and especially the Paint unpainted tool will work on the Bitmap layer. Is this far out in the future?
Kind regards

On a bitmap layer . it would be great if de somehow easy could fill white behind my black outlines so de cannot ses the background through the character. And im not talking about manually painting white behind.
In Photoshop it is very easy to create an action that selects the boundroes og a character draw in black and then fills white color behind this selection. I would like to se an actyion like tjis buildt into storyboard pro